in reply to default value for a scalar

I understand your issue now... the arguments to $osVal and $odVal can either be undef or the empty string when the default value should be used for them.

In that case, a convenient solution is the ||= operator: 

  $odVal ||= 0;
  $osVal ||= 0;

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Re^2: default value for a scalar
by rightfield (Sexton) on Apr 19, 2008 at 22:08 UTC
    Thank you pc88mxer your solution worked first time. Warm regards.
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